Best fan setup and GPU fan help?
Generally, you want air flowing through your case as follows: In through the front/bottom and out through the top/rear.
You also want neutral to slightly positive air pressure within your case. This means having the same number and size of intake fans are exhaust fans. If not, you want more intake than exhaust. Having more exhaust vs intake creates negative air pressure in the case, which decreases cooling effect and causes excessive dust collection. So you don't want negative pressure.
Your graphics card has two fans that blow air onto the card (towards it) and out around it. So keeping a supply of fresh air for those fans to draw from is important.
My suggestion to you would be to mount your additional 120mm fan as a front intake. I know it doesn't look like it, but it will be able to pull enough air through the front vents. I would also suggest adding one more 120mm fan as an intake on the side panel right where your graphics card will be mounted behind it. This will keep your system running cool and keep a slight positive pressure inside the case as well. The components you're running aren't going to produce a large amount heat, so this should be more than sufficient.
Also, just as a quite tip; if you're not sure which direction case fans blow, they always blow towards the support frame, like this:
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